Fix PCH build
Core/Spells: Small cleanup in SpellEffectInfo::CalcValue
DB/Schema/Auth: Change `account`.`os` to varchar(4)

Windows and Mac 64 bit clients send "Wn64" and "Mc64", respectively, and that does not fit in a varchar(3)
Core/Packets: Fixed SMSG_EMOTE and SMSG_TEXT_EMOTE
Merge pull request #12 from TrinityCore/6.x

merge